I can tell you the Xen numbers from my experience:
CPU: 0%
RAM: 0-10%
Disk I/O: 15-45%
Net I/O: 10-40%
It depends on what you are doing with it. For RAM - page size (larger
pages, more overhead). Disk I/O: raw device is 15%, more layers = more
overhead. Net I/O: depends on packet size. Packets of 128 B and larger
are 10%, smaller packets have more overhead for the same throughput.
Regards,
Daniel
_____
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ahmed Kamal
Sent: Tuesday, July 29, 2008 1:23 PM
To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list
Subject: Re: [rhelv5-list] ESXi vs Xen
I guess what I'm looking for is the overhead per resource between
different virtualization technologies
Overhead: RHEL-Xen ESX
CPU
RAM
Disk IO
Net IO
For example, RAM IO had a lot of overhead historically, however newer
VT-d chips are supposed to help with that. The problem is how "much"
will it help!
On Tue, Jul 29, 2008 at 12:55 PM, Zavodsky, Daniel (GE Money)
<[EMAIL PROTECTED]> wrote:
I don't think the VMware architecture is better than PV Xen in
terms of performance for Linux.
In PV Xen, you get no CPU overhead and I/O amounts to exchanging
memory pages between domains. You can't really make this more effective
on x86 hardware (including x86_64) IMHO. Besides, by using RHEL
virtualisation, you save money on licenses for the operating system as
well.
Regards,
Daniel
_____
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ahmed Kamal
Sent: Tuesday, July 29, 2008 10:19 AM
To: [email protected]
Subject: Re: [rhelv5-list] ESXi vs Xen
I understand they're stripping the HA and live migration parts.
But in terms of raw CPU and IO performance, is it much better than Xen ?
On Tue, Jul 29, 2008 at 11:16 AM, Jussi Silvennoinen
<[EMAIL PROTECTED]> wrote:
> Hi,
> Since VMware just released ESXi as a free download
(not open-source though),
> I was wondering if any of you guys had done a study on
the performance of
> ESXi vs Xen ? Of course I could locate lots of
marketing bable how each
> product is claiming to have the best "architecture"
and all .. but I'm
> looking for a real opinion
Do look more thoroughly what they actually are making
free. Might not be
enough for your use.
--
Jussi
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